Can someone please explain how to properly use the #System and how you see what tags have been updated. I'm a bit confused about it. I know you can subscribe to them, but how do you see if a # has been used? And also, do tags only get added to threads or can they be added to individual posts, too? because when i try and make a post i can't see the option to add a # or will a person notified whenever I just write out #blahblah in the post? is that how you use them?